Simplified Newton–Raphson power-flow solution method

Kulworawanichpong, Thanatchai

doi:10.1016/j.ijepes.2009.11.011

Cited by 56 publications

(24 citation statements)

References 21 publications

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“…The simplified Newton-Raphson AC power flow method has been proposed in [16]. With its remarkable features, this technique can also be applied to solve DC railway power flow problems.…”

Section: Current Injection Methods For DC Railway Power Flow Solutionmentioning

confidence: 99%

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Multi-train modeling and simulation integrated with traction power supply solver using simplified Newton–Raphson method

Kulworawanichpong

2015

J. Mod. Transport.

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Multi-train modeling and simulation plays a vital role in railway electrification during operation and planning phase. Study of peak power demand and energy consumed by each traction substation needs to be determined to verify that electrical energy flowing in its railway power feeding system is appropriate or not. Gauss-Seidel, conventional Newton-Raphson, and current injection methods are well-known and widely accepted as a tool for electrical power network solver in DC railway power supply study. In this paper, a simplified Newton-Raphson method has been proposed. The proposed method employs a set of current-balance equations at each electrical node instead of the conventional power-balance equation used in the conventional Newton-Raphson method. This concept can remarkably reduce execution time and computing complexity for multi-train simulation. To evaluate its use, Sukhumvit line of Bangkok transit system (BTS) of Thailand with 21.6-km line length and 22 passenger stopping stations is set as a test system. The multi-train simulation integrated with the proposed power network solver is developed to simulate 1-h operation service of selected 5-min headway. From the obtained results, the proposed method is more efficient with approximately 18 % faster than the conventional Newton-Raphson method and just over 6 % faster than the current injection method.

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“…The simplified Newton-Raphson AC power flow method has been proposed in [16]. With its remarkable features, this technique can also be applied to solve DC railway power flow problems.…”

Section: Current Injection Methods For DC Railway Power Flow Solutionmentioning

confidence: 99%

“…A set of current-balanced equations governing each node is selected instead of a set of conventional power-balanced equations. According to [16], the simplified Newton-Raphson method for AC power flow calculation has been proposed. With good performance and its simplicity, it is expected to have advantages over the above-mentioned methods.…”

Section: Introductionmentioning

confidence: 99%

Multi-train modeling and simulation integrated with traction power supply solver using simplified Newton–Raphson method

Kulworawanichpong

2015

J. Mod. Transport.

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“…According to the NewtonRaphson method [5][6], the decomposed real and reactive power mismatch equations of bus m are shown in (1) …”

Section: B Power Network Solutionmentioning

confidence: 99%

Effect of Train Headway on Voltage Collapse in High-Speed AC Railways

Aodsup

Kulworawanichpong

2012

2012 Asia-Pacific Power and Energy Engineering Conference

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Minimum headway is one of key factors in railway system operation. Most railway passengers normally expect that a next train will arrive at their platform as soon as possible. Due to economical and safety aspects, headway between two consecutive trains must be kept over its critical value. In this paper, multi-train simulation associated with dynamic load flow program instructed in MATLAB is employed. A 50-km AC railway power system is used for test. This test was conducted by decreasing train headway until voltage collapse occurs. As a result, the minimum train headway that causes the voltage collapse for this test system is 50 s. This confirms that the proposed algorithm can be effectively used to identify the point of voltage collapses in AC railway power systems.

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“…Multiplication parameter: This perhaps is the most exploited mathematical artifice that has been perfected to make N‐R a more reliable algorithm Rectangular coordinates: One of its initial advantages is that it uses the exact number of terms in the Taylor series approximation Multiple load flow solutions: This is one of the problems encountered early on when networks get close to the stability limit …”

Section: Introductionmentioning

confidence: 99%

Augmenting load flow software for reliable steady‐state voltage stability studies

Sarnari

Živanović

Al-Sarawi

2019

Int Trans Electr Energ Syst

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Summary For decades, researchers and practitioners have developed improvements for Newton‐Raphson (N‐R) load flow to overcome some of its limitations. In this paper, we present a novel method to solve those inherent iterative algorithm limitations. It is based on N‐R combined with a supplementary algorithm that uses the discrete Fourier transform (DFT) and robust Padé approximants (PAs) and it is suitable for planning and simulation studies. This novel method analyses bus behaviour from the loading perspective where plain N‐R may not converge to the correct results. Thus, avoiding possible performance deficiencies when bus loading approaches the stability limit or when starting point is not close enough to the actual operating value. The proposed method samples voltages in the complex domain to attain superior convergence properties, guaranteeing high accuracy within the bus‐voltage stability limits (VSLs). Additionally, as a by‐product of the proposed method, load buses can be classified according to their criticality. The presented method will suit existing N‐R‐based systems with minor modifications, allowing practitioners to preserve their investment in load flow software. Results and performance comparisons with the conventional N‐R, holomorphic embedding load flow method (HELM), and continuation power flow (CPF) are presented to demonstrate the robustness of the proposed method.

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Simplified Newton–Raphson power-flow solution method

Cited by 56 publications

References 21 publications

Multi-train modeling and simulation integrated with traction power supply solver using simplified Newton–Raphson method

Multi-train modeling and simulation integrated with traction power supply solver using simplified Newton–Raphson method

Effect of Train Headway on Voltage Collapse in High-Speed AC Railways

Augmenting load flow software for reliable steady‐state voltage stability studies

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